僧帽筋の機能 : 僧帽筋欠損症2例からの考察

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We examined the function of the trapezius from cases of isolated total absence of the trapezius. [Case 1] The elder brother. He was born at the 36th week, weight 2475g. His physical development was normal. At the age of 6, scoliosis was observed. At the age of 7, he noticed his left arm could not move like his right. This disability became gradually worse. He was referred to our hospital at 14 years old. The left scapula was elevated and the rhomboid were prominent. On the X-ray photos, the left scapula was rotated inferiorly. Flexion and abduction of the left shoulder were restricted, especially in abduction; scapula could not move smooth through 90°. Around 90°, the levator scapulae laxed and rhomboid minor and serratus anterior tracted scapula inferiorly and rotated upper. We termed this change of direction by adjusting of mooring muscles of scapula "switching". CT and MRI confirmed the absence of the trapezius. [Case 2] the younger brother. He was born at the 37th week, weight 2150g. His physical development was normal. He underwent an operation for VSD at the age of 1. He came to our hospital at 7 years old. Both scapulae were elevated and both levator scapulae were prominent. Both trapeziuses looked absent. On the X-ray photos, both scapulae were rotated inferiorly. Flexion and abduction of both shoulders were restricted. From these cases, we thought that the trapezius contribute to the smooth abduction of the shoulder through 90°. In abduction over 90°, scapula needed a change of direction by "switching".
2009-07-27

僧帽筋の機能 : 僧帽筋欠損症2例からの考察

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